Automatic fire extinguishing system for transformer of transformer substation

Abstract

The utility model discloses an automatic fire extinguishing system for a transformer substation transformer, which comprises a fire cooperative detection and alarm module, a fire fighting equipment cabin, an on-site mixed compressed air foam fire extinguishing module, a premixed foam storage tank fire extinguishing module and an intelligent fire fighting remote control module, the fire cooperative detection alarm module can identify fire risks through combustible gas concentration detection, light pattern sensing, intelligent pattern analysis and temperature and smoke sensing at the same time, and the fire alarm accuracy is remarkably improved. A combined form of on-site mixed compressed air foam fire extinguishing and premixed foam storage tank fire extinguishing is adopted, and the advantages of short action time and no need of electric drive of the premixed foam storage tank are utilized, so that the initial fire behavior is effectively controlled, the fire extinguishing is automatically triggered when a fault suddenly occurs, and the reliability of a transformer fire extinguishing system is remarkably improved.

Description

Technical field:

[0001] The utility model belongs to the technical field of transformer substation fire protection, in particular to an automatic fire extinguishing system for transformers in transformer substations. Background technology:

[0002] Substations are the hubs for power transmission and distribution. They connect power grids at all voltage levels through transformers, transforming and distributing electrical energy. Currently, substations typically use oil-immersed transformers. Combustible transformer oil decomposes easily at high temperatures, producing flammable and explosive gases such as methane, acetylene, and hydrogen. This rapidly increases internal transformer pressure, leading to ruptures in vulnerable areas such as bushings and welds, and potentially igniting fires. While fire protection regulations specify fire separation distances between oil-immersed transformers and other structures, their layout within buildings, the combustion properties of finishing materials, and the selection of fire detection and extinguishing systems, the "Fire Protection Design Standard for Thermal Power Plants and Substations" (GB50229-2019) also stipulates that oil-immersed transformers must be equipped with water spray or other fire extinguishing systems. Furthermore, various new fire extinguishing systems, not specifically designed for oil-immersed transformers, such as high-volume water spray, high-pressure fine water mist, water monitors, foam monitors, ready-mix foam, and compressed air foam, are increasingly being adopted in transformer fire extinguishing systems to meet firefighting needs in various environments.

[0003] At present, the response time of the freshly mixed compressed air foam fire extinguishing system is relatively long, and the fire protection system of substations in harsh environmental areas such as Shagohuang is prone to failure. When a fire occurs in a substation, the compressed air foam fire extinguishing system cannot respond quickly, or the fire protection system cannot be started normally due to failure, resulting in failure to suppress the fire in a timely and effective manner, and there is a risk of further expanding the fire. In addition, some substation fire protection systems built in harsh environmental areas such as Shagohuang often have problems with high failure rates of fire detection systems and low alarm accuracy. When a fire occurs, the fire detection system cannot detect the fire, and the freshly mixed compressed air foam fire extinguishing system cannot be started normally, resulting in missing the best time to extinguish the fire. Especially the fire protection system of substations in remote areas that adopt unmanned management is more prone to failure, and the reliability of its fire protection system cannot be effectively guaranteed. Utility model content:

[0004] In view of this, the purpose of the present invention is to provide a fast-response automatic fire extinguishing system for transformers in substations, so as to solve the above-mentioned technical problems raised by the present invention.

[0005] The utility model is implemented by the following technical solutions: a fast response automatic fire extinguishing system for transformers in substations, including a freshly mixed compressed air foam fire extinguishing module, a premixed foam storage tank fire extinguishing module and a smart fire remote control module.

[0006] The liquid outlet of the foam proportion mixing device of the freshly mixed compressed air foam fire extinguishing module is connected to the liquid inlet of the premixed foam liquid storage tank of the premixed foam storage tank fire extinguishing module through a premixed foam liquid inlet pipe, and a booster delivery pump is provided on the premixed foam liquid inlet pipe. A one-way valve is provided on the premixed foam liquid inlet pipe between the liquid inlet of the premixed foam liquid storage tank and the booster delivery pump. The fire linkage controller of the smart fire remote control module is respectively connected to the solenoid valve of the freshly mixed compressed air foam fire extinguishing module and the booster delivery pump signal of the premixed foam storage tank fire extinguishing module.

[0007] The premixed foam tank fire extinguishing module includes a premixed foam tank, an air compressor, and a foam generator. An air bag is arranged inside the premixed foam tank, and the air bag is connected to the air compressor through an inflation pipe. The liquid outlet of the premixed foam tank is connected to the liquid inlet of the foam generator through a premixed foam liquid outlet pipe. The liquid outlet of the foam generator is connected to the premixed foam nozzle through a premixed foam spray pipe. The premixed foam nozzle is arranged above the main transformer body. The nozzle of the premixed foam tank adopts a fusible alloy nozzle.

[0008] Furthermore, a pressure sensor is provided on the inflation tube, the pressure sensor is electrically connected to the air compressor, and a pressure gauge is provided on the top of the premixed foam storage tank.

[0009] Furthermore, the foam generator consists of a contraction area, a throat area and a diffusion area. The liquid inlet of the foam generator is arranged on the contraction area, the liquid outlet of the foam generator is arranged on the diffusion area, the throat area is connected to an air intake pipe, and a check valve is provided on the air intake pipe.

[0010] Furthermore, the ready-mixed compressed air foam fire extinguishing module includes a buffer water tank, a ready-mixed foam liquid storage tank, a foam proportioning mixing device, an air supply device, a gas-liquid mixing device and a control device. The water outlet of the buffer water tank is connected to the water inlet of the foam proportioning mixing device through a fire water pump, the foam outlet of the ready-mixed foam liquid storage tank is connected to the foam inlet of the foam proportioning mixing device, the liquid outlet of the foam proportioning mixing device is connected to the liquid inlet of the gas-liquid mixing device through a pipeline, a solenoid valve is provided on the pipeline, the air outlet of the air supply device is connected to the air inlet of the gas-liquid mixing device, the liquid outlet of the gas-liquid mixing device is connected to the compressed air foam nozzle through a compressed air foam spray pipe, and the compressed air foam nozzle is arranged above the main transformer body.

[0011] Furthermore, the signal input end of the fire linkage controller is respectively connected to the signal output end of the combustible gas alarm, the fire detection camera and the smoke and heat fire detector, and the signal output end of the fire linkage controller is respectively connected to the signal input end of the fire emergency broadcast, the sound and light alarm and the graphic display. The combustible gas alarm, the fire detection camera and the smoke and heat fire detector are installed in the main transformer room, and the main transformer body is installed in the main transformer room.

[0012] Furthermore, the ready-mixed compressed air foam fire extinguishing module, the premixed foam storage tank fire extinguishing module and the smart fire remote control module are all installed in the fire equipment cabin, the emergency broadcast is fixedly installed on the outer top of the fire equipment cabin, the sound and light alarm is fixedly installed on the outer side wall of the fire equipment cabin, and the fire linkage controller and the graphic display are installed on the console inside the fire equipment cabin.

[0013] Furthermore, the fire-fighting equipment cabin is assembled in an assembled manner, and the inner and outer surfaces of the top plate, side plate and bottom plate of the fire-fighting equipment cabin are coated with nano aerogel thermal insulation coating, and glass windows and sand-proof vents are provided on the side walls of the fire-fighting equipment cabin.

[0014] Advantages of this utility model:

[0015] 1. The utility model adopts two automatic fire extinguishing systems: freshly mixed compressed air foam fire extinguishing and premixed foam storage tank fire extinguishing. Among them, the premixed foam storage tank, the core component of the premixed foam storage tank fire extinguishing module, is a pressure vessel, which stores foam premix in high pressure. At the same time, the premixed foam nozzle arranged above the main transformer is a fusible alloy nozzle. When a fire occurs, it can be actuated in a very short time and triggered in a chain manner. It is started before the freshly mixed compressed air foam fire extinguishing module starts to operate, which makes up for the defect of long response time of the freshly mixed compressed air foam fire extinguishing module. It can play a good role in suppressing the fire at the beginning, or even directly extinguish it, effectively reducing related losses. It can also automatically trigger fire extinguishing when the freshly mixed compressed air foam fire extinguishing module, the fire cooperative detection and alarm module and the smart fire remote control module fail. It can operate without any electricity, which significantly improves the reliability of the substation transformer fire protection system.

[0016] 2. The utility model significantly improves the accuracy of fire alarms by combining combustible gas alarms, fire detection cameras and smoke and heat fire detectors. Description of the drawings:

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a structural diagram of the instant mixed compressed air foam fire extinguishing module of the utility model;

[0020] Figure 3 This is a structural diagram of the premixed foam storage tank fire extinguishing module of the utility model;

[0021] In the figure, 1. Fire collaborative detection alarm module; 11. Combustible gas alarm; 12. Fire detection camera; 13. Smoke and heat fire detectors; 2. Fire equipment cabin; 21. Top plate; 22. Side plate; 23. Bottom plate; 24. Glass window; 25. Sand-proof vent; 26. Fire distribution cabinet; 3. Ready-mixed compressed air foam fire extinguishing module; 31. Buffer water tank; 32. Fire water pump; 33. Ready-mixed foam liquid storage tank; 34. Foam proportioning mixing device; 35. Air supply device; 36. Gas-liquid mixing device; 37. Control device; 38. Support frame; 4. Premixed foam storage tank fire extinguishing module; 41. Premixed foam storage tank; 42. Flange; 43. Air bag; 44. Inflatable pipe; 45. Air compressor ; 46. Pressure sensor; 47. Pressure gauge; 48. Premixed foam inlet pipe; 49. One-way valve; 410. Booster delivery pump; 411. Premixed foam outlet pipe; 412. Foam generator; 4121. Contraction area; 4122. Throat area; 4123. Diffusion area; 4124. Intake pipe; 4125. Check valve; 5. Smart fire remote control module; 51. Fire emergency broadcast; 52. Sound and light alarm; 53. Fire linkage console; 54. Graphic display; 55. Fire linkage controller; 6. Main transformer room; 61. Main transformer body; 62. Compressed air foam nozzle; 63. Premixed foam nozzle; 64. Compressed air foam spray pipe; 65. Premixed foam spray pipe. Specific implementation method:

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figure 1-3 As shown, a fast-response automatic fire extinguishing system for transformers in a substation includes a fire collaborative detection and alarm module 1, a fire-fighting equipment cabin 2, a freshly mixed compressed air foam fire extinguishing module 3, a premixed foam storage tank fire extinguishing module 4, and a smart fire remote control module 5;

[0025] The ready-mixed compressed air foam fire extinguishing module 3 , the premixed foam storage tank fire extinguishing module 4 and the smart fire remote control module are installed in the fire fighting equipment cabin 2 , and the fire collaborative detection and alarm module 1 is arranged in the main transformer room 6 .

[0026] The liquid outlet of the foam proportion mixing device 34 of the freshly mixed compressed air foam fire extinguishing module 3 is communicated with the liquid inlet of the premixed foam liquid storage tank 33 of the premixed foam storage tank fire extinguishing module 4 through a premixed foam liquid inlet pipe 48, and a booster delivery pump 410 is provided on the premixed foam liquid inlet pipe 48. A one-way valve 49 is provided on the premixed foam liquid inlet pipe 48 between the liquid inlet of the premixed foam liquid storage tank 33 and the booster delivery pump 410. The fire linkage controller 55 of the smart fire remote control module is respectively connected to the solenoid valve of the freshly mixed compressed air foam fire extinguishing module 3 and the booster delivery pump 410 of the premixed foam storage tank fire extinguishing module 4 by signal;

[0027] The premixed foam tank fire extinguishing module 4 includes a premixed foam tank 41, an air compressor 45, and a foam generator 412. The premixed foam tank 41 is a cylindrical pressure vessel that stores foam premix liquid in a high-pressure form and is fixed and sealed by a flange 42 on the side wall, which is convenient for installation, maintenance and regular cleaning. An air bag 43 is arranged inside the premixed foam tank 41. The air bag 43 is connected to the air compressor 45 through an inflation pipe 44. A pressure sensor 46 is provided on the inflation pipe 44. The pressure sensor 46 is electrically connected to the air compressor 45. The opening and closing of the air compressor 45 is controlled by the pressure sensor 46. When the pressure in the air bag 43 is less than the set value, the air compressor 45 automatically starts and inflates upon receiving a signal from the pressure sensor 46. When the pressure in the air bag 43 is greater than or equal to the set value, the air compressor 45 is closed. A pressure gauge 47 is provided on the top of the premixed foam tank 41 to display the pressure of the foam liquid in the premixed foam tank 41. The liquid outlet of the premixed foam storage tank 41 is connected to the liquid inlet of the foam generator 412 through the premixed foam liquid outlet pipe 411, and the liquid outlet of the foam generator 412 is connected to the premixed foam nozzle 63 through the premixed foam spray pipe 65. The premixed foam nozzle 63 is arranged above the main transformer body 61, and the premixed foam storage tank nozzle adopts a fusible alloy nozzle. In this embodiment, the premixed foam storage tank 41 stores foam premix liquid in a high-pressure form. When a fire occurs, the fusible alloy of the premixed foam nozzle 63 melts and breaks to open the premixed foam nozzle 63. The premixed foam storage tank 41 is connected to the premixed foam nozzle 63. At the same time, the foam premix liquid stored in the premixed foam storage tank 41 in a high-pressure form is connected to the outside world. There is a large pressure difference between the high pressure in the premixed foam storage tank 41 and the outside world. Therefore, the foam premix liquid stored in the premixed foam storage tank 41 is ejected from the premixed foam nozzle 63 at high speed in a very short time to extinguish the fire, and the fire starts when the compressed air foam fire extinguishing module 3 starts to mix. It is started before operation to make up for the defect of long response time of the freshly mixed compressed air foam fire extinguishing module 3. It can play a good suppressive role on the fire at the beginning, or even extinguish it directly, effectively reducing related losses. It can also automatically trigger fire extinguishing when faults occur in the freshly mixed compressed air foam fire extinguishing module 3, the fire collaborative detection and alarm module 1 and the smart fire remote control module 5. It can operate without any electricity, which significantly improves the reliability of the substation transformer fire protection system. It is suitable for use in areas with harsh climates and extreme temperatures, and has the advantages of long life, stable performance, accurate action temperature and fast response speed.

[0028] The foam generator 412 consists of a contraction section 4121, a throat section 4122, and a diffusion section 4123. The liquid inlet of the foam generator 412 is located in the contraction section 4121, and the liquid outlet is located in the diffusion section 4123. An air intake pipe 4124 is connected to the throat section 4122 and is equipped with a check valve 4125. When the premixed foam nozzle 63 reaches the operating temperature and melts and ruptures, the high-pressure foam premix stored in the premixed foam storage tank 41 enters the premixed foam liquid outlet pipe 411. As it rapidly flows through the throat section 4122 of the foam generator 412, it draws in and mixes with external air through the air intake pipe 4124, forming a compressed air foam liquid for fire extinguishing. A check valve 4125 is provided on the air intake pipe 4124 of the foam generator 412 to prevent the foam liquid from flowing out through the air intake pipe 4124.

[0029] The ready-mix compressed air foam fire extinguishing module 3 includes a buffer water tank 31, a ready-mix foam liquid storage tank 33, a foam proportioning device 34, an air supply device 35, a gas-liquid mixing device 36, and a control device 37. The ready-mix compressed air foam fire extinguishing module 3 is integrated and mounted on a support frame 38 within the firefighting equipment cabin 2. The water outlet of the buffer water tank 31 is connected to the water inlet of the foam proportioning device 34 via a fire water pump 32. The foam outlet of the ready-mix foam liquid storage tank 33 is connected to the foam inlet of the foam proportioning device 34. The liquid outlet of the foam proportioning device 34 is connected to the liquid inlet of the gas-liquid mixing device 36 via a pipe equipped with a solenoid valve. The air outlet of the air supply device 35 is connected to the air inlet of the gas-liquid mixing device 36. The liquid outlet of the gas-liquid mixing device 36 is connected to the compressed air foam nozzle 62 via a compressed air foam spray pipe 64. The compressed air foam nozzle 62 is located above the main transformer body 61.

[0030] The smart fire remote control module 5 also includes a fire emergency broadcast 51, an audible and visual alarm 52, a fire linkage console 53, and a graphic display 54. The fire emergency broadcast 51 is fixedly mounted on the top of the fire equipment cabin 2, and the audible and visual alarm 52 is fixedly mounted on the upper part of the outer wall of the fire equipment cabin 2, so that fire alarm signals can be sent through multiple channels to maximize the warning effect. The fire linkage console 53 is placed on the ground inside the fire equipment cabin 2, and the graphic display 54 and fire linkage controller 55 are fixedly mounted on the fire linkage console 53 for fire linkage control. The emergency broadcast is fixedly mounted on the top of the fire equipment cabin 2, the audible and visual alarm 52 is fixedly mounted on the outer wall of the fire equipment cabin 2, and the fire linkage controller 55 and the graphic display 54 are mounted on the console inside the fire equipment cabin 2. A fire distribution cabinet 26 is set in the fire equipment cabin 2 to provide a dedicated power supply for the fire equipment.

[0031] The fire cooperative detection and alarm module 1 includes a combustible gas alarm 11, a fire detection camera 12, and a smoke and heat fire detector 13. The signal input end of the fire linkage controller 55 is respectively connected to the signal output ends of the combustible gas alarm 11, the fire detection camera 12, and the smoke and heat fire detector 13. The signal output end of the fire linkage controller 55 is respectively connected to the signal input ends of the fire emergency broadcast 51, the sound and light alarm 52, and the graphic display 54. The combustible gas alarm 11 is arranged on the upper part of the inner wall of the main transformer room 6, at a height of 1-1.5m above the main transformer body 61, and identifies the fire risk by detecting the combustible gas concentration in the main transformer room 6. When the concentration of combustible gases such as methane, acetylene and hydrogen reaches the set limit, the combustible gas alarm 11 immediately sends out an audible and visual alarm signal, and at the same time transmits it to the mobile terminal and the smart fire remote control module 5 through the network; the fire detection camera 12 is arranged on the upper part of the inner wall of the main transformer room 6, and identifies the flame through light pattern sensing and intelligent pattern analysis, with a response time of less than 1S, and transmits it to the mobile terminal and the smart fire remote control module 5 through the network; the smoke and heat fire detector 13 is arranged on the inner top of the main transformer room 6, and identifies the fire risk by sensing temperature and smoke. The combustible gas alarm 11, the fire detection camera 12 and the smoke and heat fire detector 13 are used in coordination to significantly improve the accuracy of fire alarm;

[0032] The fire-fighting equipment cabin 2 is assembled in an assembled manner and is manufactured in an assembled manner based on the BIMBase platform. The fire-fighting equipment cabin 2 includes a top plate 21, a side plate 22 and a bottom plate 23. The top plate 21 is made of 2mm aluminum alloy panels laid on an aluminum alloy light keel, the side plates 22 are assembled by splicing 28mm flat aluminum honeycomb panels, and the bottom plate 23 is a 30mm aluminum profile; the top longitudinal beam is a 4mm thick aluminum profile, the top plate 21 is laid on the longitudinal beam, and the bottom longitudinal beam and bottom cross beam are fixed on the bottom plate 23. The bottom longitudinal beam is a 3mm thick 304 stainless steel plate pressed profile, and the bottom cross beam is a 2.5mm thick 304 stainless steel plate pressed profile. The inside and outside of the top plate 21, the side plates 22 and the bottom plate 23 are all painted with 2mm nano aerogel thermal insulation coating, and the surface of the bottom longitudinal beam and the bottom cross beam is electrostatically sprayed with anti-corrosion paint. By adopting prefabricated design and assembly, we can achieve standardized design, factory production and prefabricated construction of fire protection systems, and solve a series of problems caused by the harsh environment of the Shagohuang area, such as long construction period, low construction standards and non-standard equipment installation.

[0033] The side walls of the fire-fighting equipment cabin 2 are provided with glass windows 24, which are double-layer hollow glass windows. The side walls of the fire-fighting equipment cabin 2 are also provided with sand-proof ventilation holes 25, which can effectively alleviate the impact of the harsh environment of sand and wasteland on the environment inside the fire-fighting equipment cabin 2.

[0034] When the premixed foam tank fire extinguishing module 4 is first inflated and the foam mixture is injected, the following steps are performed:

[0035] 1. When there is no foam mixture in the premixed foam storage tank 41, start the air compressor 45 to inflate the airbag 43. When the pressure in the airbag 43 reaches 0.16 MPa, the airbag 43 expands to fill the entire premixed foam storage tank 41. At this time, turn off the air compressor 45.

[0036] 2. Start the fire water pump 32 and the foam proportioning device 34. The foam mixture formed by mixing foam and water is injected into the premixed foam liquid storage tank 41 through the booster delivery pump 410. As the liquid level inside the premixed foam liquid storage tank 41 rises, the airbag 43 is compressed. When the volume of the injected foam mixture reaches 80% of the total volume of the premixed foam liquid storage tank 41, the pressure in the premixed foam liquid storage tank 41 will reach 0.8 MPa. At this time, the injection of the foam mixture is stopped.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic fire extinguishing system for transformers in substations, characterized by: Including ready-mixed compressed air foam fire extinguishing module, premixed foam storage tank fire extinguishing module and smart fire remote control module; The liquid outlet of the foam proportion mixing device of the freshly mixed compressed air foam fire extinguishing module is connected to the liquid inlet of the premixed foam liquid storage tank of the premixed foam storage tank fire extinguishing module through a premixed foam liquid inlet pipe, and a booster delivery pump is provided on the premixed foam liquid inlet pipe. A one-way valve is provided on the premixed foam liquid inlet pipe between the liquid inlet of the premixed foam liquid storage tank and the booster delivery pump. The fire linkage controller of the smart fire remote control module is respectively connected to the solenoid valve of the freshly mixed compressed air foam fire extinguishing module and the booster delivery pump signal of the premixed foam storage tank fire extinguishing module; The premixed foam tank fire extinguishing module includes a premixed foam tank, an air compressor, and a foam generator. An air bag is arranged inside the premixed foam tank, and the air bag is connected to the air compressor through an inflation pipe. The liquid outlet of the premixed foam tank is connected to the liquid inlet of the foam generator through a premixed foam liquid outlet pipe. The liquid outlet of the foam generator is connected to the premixed foam nozzle through a premixed foam spray pipe. The premixed foam nozzle is arranged above the main transformer body. The nozzle of the premixed foam tank adopts a fusible alloy nozzle.

2. The automatic fire extinguishing system for transformers in substations according to claim 1, characterized in that: A pressure sensor is provided on the inflation pipe, and the pressure sensor is electrically connected to the air compressor. A pressure gauge is provided on the top of the premixed foam storage tank.

3. The automatic fire extinguishing system for transformers in substations according to any one of claims 1 or 2, characterized in that: The foam generator consists of a contraction area, a throat area and a diffusion area. The liquid inlet of the foam generator is arranged on the contraction area, the liquid outlet of the foam generator is arranged on the diffusion area, the throat area is connected to an air intake pipe, and a check valve is provided on the air intake pipe.

4. The automatic fire extinguishing system for transformers in substations according to claim 1, characterized in that: The ready-mixed compressed air foam fire extinguishing module includes a buffer water tank, a ready-mixed foam liquid storage tank, a foam proportioning mixing device, an air supply device, a gas-liquid mixing device and a control device. The water outlet of the buffer water tank is connected to the water inlet of the foam proportioning mixing device through a fire water pump, the foam outlet of the ready-mixed foam liquid storage tank is connected to the foam inlet of the foam proportioning mixing device, the liquid outlet of the foam proportioning mixing device is connected to the liquid inlet of the gas-liquid mixing device through a pipeline, and a solenoid valve is provided on the pipeline. The air outlet of the air supply device is connected to the air inlet of the gas-liquid mixing device, and the liquid outlet of the gas-liquid mixing device is connected to the compressed air foam nozzle through a compressed air foam spray pipe, and the compressed air foam nozzle is arranged above the main transformer body.

5. The automatic fire extinguishing system for transformers in substations according to claim 1, characterized in that: The signal input end of the fire linkage controller is respectively connected to the signal output end of the combustible gas alarm, the fire detection camera and the smoke and heat fire detector; the signal output end of the fire linkage controller is respectively connected to the signal input end of the fire emergency broadcast, the sound and light alarm and the graphic display; the combustible gas alarm, the fire detection camera and the smoke and heat fire detector are installed in the main transformer room; and the main transformer body is installed in the main transformer room.

6. The automatic fire extinguishing system for transformers in substations according to claim 5, characterized in that: The ready-mixed compressed air foam fire extinguishing module, the premixed foam storage tank fire extinguishing module and the smart fire remote control module are all installed in the fire equipment cabin, the emergency broadcast is fixedly installed on the outer top of the fire equipment cabin, the sound and light alarm is fixedly installed on the outer side wall of the fire equipment cabin, and the fire linkage controller and the graphic display are installed on the console inside the fire equipment cabin.

7. The automatic fire extinguishing system for transformers in substations according to claim 6, characterized in that: The fire-fighting equipment cabin is assembled in an assembled manner. The inner and outer surfaces of the top plate, side plate and bottom plate of the fire-fighting equipment cabin are coated with nano aerogel thermal insulation coating. Glass windows and sand-proof vents are provided on the side walls of the fire-fighting equipment cabin.

Images